Performance measures for interconnection networks

Bandwidth (Raw bandwidth)

--- the number of megabits

the network can propagate per second

Includes headers, trailers!

Time of flight

--- the time needed for a bit to travel between the 2 nodes

Includes the delays due to repeaters/switches

When there are no delays, this is 2*(distance / speed of light)

299,792.5 km/sec

Transmission time

--- message size / bandwidth

Transport latency

--- time of flight + transmission time

Sender overhead

--- the time needed for the sender to inject (the first bit of)

the message into the network

Receiver overhead

--- similar.

Longer than sender overhead!

7

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